[llvm] [AMDGPU] Add APIs `getTotalNumVGPRs` and `getAddressableNumVGPRs` to TargetParser (PR #220695)

[Shilei Tian via llvm-commits]

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@@ -869,7 +869,14 @@ class GCNSubtarget final : public AMDGPUGenSubtargetInfo,
 
   /// \returns Addressable number of VGPRs supported by the subtarget.
   unsigned getAddressableNumVGPRs(unsigned DynamicVGPRBlockSize) const {
-    return AMDGPU::IsaInfo::getAddressableNumVGPRs(*this, DynamicVGPRBlockSize);
+    // Dynamic VGPR mode is a per-kernel mode, so it is not covered by the
+    // TargetParser query.
+    if (DynamicVGPRBlockSize != 0) {
+      return AMDGPU::IsaInfo::getAddressableNumVGPRs(*this,
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shiltian wrote:

What was the reason that this `getAddressableNumVGPRs` is still in `IsaInfo`?

https://github.com/llvm/llvm-project/pull/220695