Increase memory of BOLT runtime instrumentation bump allocator used f…

…or writing resulting profile

The BOLT instrumentation runtime uses a bump allocator that has a fixed amount of maximum memory. In some cases, this memory limit is not large enough (#59174). We are hitting this limit when instrumenting the Rust compiler with BOLT.

This change increases the memory of the bump allocator used for writing the resulting BOLT profile.

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D151891

bolt/runtime/instr.cpp

@@ -1471,6 +1471,7 @@ __bolt_instr_data_dump() {
   int FD = openProfile();
 
   BumpPtrAllocator Alloc;
+  Alloc.setMaxSize(0x6400000);
   const uint8_t *FuncDesc = Ctx.FuncDescriptions;
   for (int I = 0, E = __bolt_instr_num_funcs; I < E; ++I) {
     FuncDesc = writeFunctionProfile(FD, Ctx, FuncDesc, Alloc);