Add lint message for unexpected and/or in if statement

[csmoe]

Closes #54109
r? @estebank

[vi]

It's just happened that I was also trying to solve it.

Competing pull request: #54181

[csmoe]

@vi your approach is more clever than me actually.

[rust-highfive]

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:45:08] ....................................................................................................
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[00:45:15] ...............................i..................................................................i.
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---
[00:50:46] .............................................................i......................................
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[00:50:52] ....................................................................................................
[00:50:55] ....................................................................................................
at" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/if/if-with-and/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/if/if-with-and/auxiliary" "-A" "unused"
[00:50:57]     Error {
[00:50:57]         line_num: 14,
[00:50:57]         kind: Some(
[00:50:57]             Error
[00:50:57]             Error
[00:50:57]         ),
[00:50:57]         msg: "14:15: 14:18: expected `{`, found `and`"
[00:50:57] ]
[00:50:57] 
[00:50:57] not found errors (from test file): [
[00:50:57]     Error {
[00:50:57]     Error {
[00:50:57]         line_num: 16,
[00:50:57]         kind: Some(
[00:50:57]             Error
[00:50:57]         ),
[00:50:57]         msg: "expected `{`, found `}`"
[00:50:57] ]
[00:50:57] 
[00:50:57] thread '[ui] ui/if/if-with-and.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:1283:13
[00:50:57] 
---
[00:50:57] 
[00:50:57] thread 'main' panicked at 'Some tests failed', tools/compiletest/src/main.rs:496:22
[00:50:57] 
[00:50:57] 
[00:50:57] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/ui" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "ui" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-5.0/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Zunstable-options " "--target-rustcflags" "-Crpath -O -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "5.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[00:50:57] 
[00:50:57] 
[00:50:57] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[00:50:57] Build completed unsuccessfully in 0:07:27
[00:50:57] Build completed unsuccessfully in 0:07:27
[00:50:57] Makefile:58: recipe for target 'check' failed
[00:50:57] make: *** [check] Error 1
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:14d03fc2
$ dmesg | grep -i kill

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[estebank]

Closing in lieu of #54181. Thanks for the contribution regardless!