LLVM 21 support

[aykevl]

This is nowhere near finished, I've seen a few issues already. So it is marked as WIP until then.

[aykevl]

There is a rather tricky bug in WebAssembly. It looks like it has something to do with concurrency (-scheduler=none hides the bug, but inserting the right println lines also hides the bug so 🤷‍♀️). This is going to be fun to debug.

@dgryski is this something you'd want to take a look at? Reproducing it is straightforward: take this branch, do go install on a system with LLVM 21, and running tinygo run -target=wasip1 ./testdata/gc.go (it crashes on exit).

[github-actions]

Size difference with the dev branch:

Binary size difference

not the same command!
    '-xesppie' is not a recognized feature for this target (ignoring feature)
    '-xmipscmove' is not a recognized feature for this target (ignoring feature)
not the same command!
    '-xesppie' is not a recognized feature for this target (ignoring feature)
    '-xmipscmove' is not a recognized feature for this target (ignoring feature)
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   8788    9916   1128  12.84%    4740    4740      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l293x/speed/main.go
   8096    9264   1168  14.43%    4740    4748      8   0.17% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bh1750/main.go
  71572   72764   1192   1.67%    3656    3720     64   1.75% tinygo build -size short -o ./build/test.hex -target=pinetime     ./examples/bma42x/main.go
   7456    8652   1196  16.04%    4740    4748      8   0.17% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/blinkm/main.go
   7548    8764   1216  16.11%    4748    4756      8   0.17% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mma8653/main.go
  87872   89088   1216   1.38%    7260    7260      0   0.00% tinygo build -size short -o ./build/test.hex -target=challenger-rp2040 ./examples/net/ntpclient/
  71212   72476   1264   1.77%    6344    6344      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/alarm/
  71036   72356   1320   1.86%    6344    6344      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/timer/
 166364  167692   1328   0.80%    9992    9992      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/
  70644   72004   1360   1.93%    6340    6340      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/time/
 119576  121144   1568   1.31%    8020    8020      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 -stack-size 8kb ./examples/net/tcpclient/
 307896  309584   1688   0.55%   15924   15924      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
  16512   18268   1756  10.63%    4740    4740      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/thermistor/main.go
   6796    8724   1928  28.37%    2272    2272      0   0.00% '-xesppie' is not a recognized feature for this target (ignoring feature)
  57792   59900   2108   3.65%    3696    3696      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht4x/main.go
  57800   59932   2132   3.69%    3688    3688      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht3x/main.go
 155420  157580   2160   1.39%    8812    8804     -8  -0.09% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
  37720   39884   2164   5.74%    6048    6056      8   0.13% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/pcf8523/
   5622    7846   2224  39.56%    9538    9538      0   0.00% '-xesppie' is not a recognized feature for this target (ignoring feature)
  69568   72028   2460   3.54%    6368    6376      8   0.13% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/ds3231/main.go
 388420  395932   7512   1.93%   18772   19112    340   1.81% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/
6249468 6311280  61812   0.02%  963434  965226   1792   0.00%