[MCA] Fix a warning

This patch fixes the warning

  InstructionTables.cpp:27:56: error: loop variable 'Resource' of type
  'const std::pair<const uint64_t, ResourceUsage> &' (aka 'const
  pair<const unsigned long, llvm::mca::ResourceUsage> &') binds to a
  temporary constructed from type 'const std::pair<unsigned long,
  llvm::mca::ResourceUsage> &' [-Werror,-Wrange-loop-construct]

Note that Resource is declared as:

   SmallVector<std::pair<uint64_t, ResourceUsage>, 4> Resources;

without "const" for uint64_t.

Author: kazutakahirata

llvm/lib/MCA/Stages/InstructionTables.cpp

@@ -24,7 +24,7 @@ Error InstructionTables::execute(InstRef &IR) {
   UsedResources.clear();
 
   // Identify the resources consumed by this instruction.
-  for (const std::pair<const uint64_t, ResourceUsage> &Resource :
+  for (const std::pair<uint64_t, ResourceUsage> &Resource :
        Desc.Resources) {
     // Skip zero-cycle resources (i.e., unused resources).
     if (!Resource.second.size())