[NFC][HIP][SPIRV] Fix linking / translation step on Windows

[AlexVlx]

For the case when multiple .bc files are fed into the link stage we were re-using the provided output filename as intermediate target for bitcode linking. This does not work in Windows, where we'd subsequently try to use it both as input to and output from the translator. Thus, we switch over to using a temporary file as the bitcode linking target, iff it is necessary.

[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff origin/main HEAD --extensions cpp,c -- clang/lib/Driver/ToolChains/HIPAMD.cpp clang/test/Driver/spirv-amd-toolchain.c

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View the diff from clang-format here.

diff --git a/clang/lib/Driver/ToolChains/HIPAMD.cpp b/clang/lib/Driver/ToolChains/HIPAMD.cpp
index 8b8d6e6f5..68d6aa247 100644
--- a/clang/lib/Driver/ToolChains/HIPAMD.cpp
+++ b/clang/lib/Driver/ToolChains/HIPAMD.cpp
@@ -170,8 +170,8 @@ void AMDGCN::Linker::constructLinkAndEmitSpirvCommand(
 
   InputInfo LinkedBC = Inputs.front();
   if (Inputs.size() > 1) {
-    std::string TempPath = C.getDriver().GetTemporaryPath("pre-spirv-translate",
-                                                          "bc");
+    std::string TempPath =
+        C.getDriver().GetTemporaryPath("pre-spirv-translate", "bc");
     LinkedBC = InputInfo(&JA, C.getArgs().MakeArgString(TempPath),
                          Output.getBaseInput());
     constructLlvmLinkCommand(C, JA, Inputs, LinkedBC, Args);