Look for amd-llvm-spirv instead of llvm-spirv

Instead of llvm-spirv we look for the amd-llvm-spirv, which
is our ephemeral, temporary build of the translator that nests changes that
are not in upstream. This will be removed in the future.

Change-Id: I71854425277a62441148e03ab46af3d241c0ad07

Author: searlmc1

clang/lib/Driver/ToolChains/SPIRV.cpp

@@ -35,11 +35,17 @@ void SPIRV::constructTranslateCommand(Compilation &C, const Tool &T,
 
   // Try to find "llvm-spirv-<LLVM_VERSION_MAJOR>". Otherwise, fall back to
   // plain "llvm-spirv".
+  // AMD FORK ONLY: instead of llvm-spirv we look for the amd-llvm-spirv, which
+  // is our ephemeral, temporary build of the translator that nests changes that
+  // are not in upstream. This will be removed in the future.
   using namespace std::string_literals;
   auto VersionedTool = "llvm-spirv-"s + std::to_string(LLVM_VERSION_MAJOR);
+  if (T.getToolChain().getTriple().getVendor() == llvm::Triple::VendorType::AMD)
+    VersionedTool.insert(0, "amd-");
   std::string ExeCand = T.getToolChain().GetProgramPath(VersionedTool.c_str());
   if (!llvm::sys::fs::can_execute(ExeCand))
-    ExeCand = T.getToolChain().GetProgramPath("llvm-spirv");
+    ExeCand = T.getToolChain().GetProgramPath(
+        VersionedTool.substr(0, VersionedTool.find_last_of('-')).c_str());
 
   const char *Exec = C.getArgs().MakeArgString(ExeCand);
   C.addCommand(std::make_unique<Command>(JA, T, ResponseFileSupport::None(),