[clang] [clang][AMDGPU] Enable module splitting by default (PR #128509)

[Shilei Tian via cfe-commits]

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@@ -708,6 +712,34 @@ void amdgpu::getAMDGPUTargetFeatures(const Driver &D,
                             options::OPT_m_amdgpu_Features_Group);
 }
 
+static unsigned GetFullLTOPartitions(const Driver &D, const ArgList &Args) {
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shiltian wrote:

```suggestion
static unsigned getFullLTOPartitions(const Driver &D, const ArgList &Args) {
```

https://github.com/llvm/llvm-project/pull/128509