[NFC][AMDGPU] Use !foreach to replace explicit list of registers

Author: shiltian

llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td

@@ -67,7 +67,7 @@ def RetCC_SI_Gfx : CallingConv<[
 def CC_SI_SHADER : CallingConv<[
 
   CCIfType<[i1], CCPromoteToType<i32>>,
-  
+
   CCIfInReg<CCIfType<[f32, i32, f16, i16, v2i16, v2f16, bf16, v2bf16] , CCAssignToReg<[
     SGPR0, SGPR1, SGPR2, SGPR3, SGPR4, SGPR5, SGPR6, SGPR7,
     SGPR8, SGPR9, SGPR10, SGPR11, SGPR12, SGPR13, SGPR14, SGPR15,
@@ -194,23 +194,19 @@ def CC_AMDGPU_Func : CallingConv<[
     !foreach(i, !range(0, 30), !cast<Register>("SGPR"#i))  // SGPR0-29
   >>>,
 
-  CCIfType<[i32, f32, i16, f16, v2i16, v2f16, i1, bf16, v2bf16], CCAssignToReg<[
-    VGPR0, VGPR1, VGPR2, VGPR3, VGPR4, VGPR5, VGPR6, VGPR7,
-    VGPR8, VGPR9, VGPR10, VGPR11, VGPR12, VGPR13, VGPR14, VGPR15,
-    VGPR16, VGPR17, VGPR18, VGPR19, VGPR20, VGPR21, VGPR22, VGPR23,
-    VGPR24, VGPR25, VGPR26, VGPR27, VGPR28, VGPR29, VGPR30, VGPR31]>>,
+  CCIfType<[i32, f32, i16, f16, v2i16, v2f16, i1, bf16, v2bf16], CCAssignToReg<
+    !foreach(i, !range(0, 32), !cast<Register>("VGPR"#i))  // VGPR0-31
+  >>,
   CCIfType<[i32, f32, v2i16, v2f16, i16, f16, i1, bf16, v2bf16], CCAssignToStack<4, 4>>
 ]>;
 
 // Calling convention for leaf functions
 def RetCC_AMDGPU_Func : CallingConv<[
   CCIfType<[i1], CCPromoteToType<i32>>,
   CCIfType<[i1, i16], CCIfExtend<CCPromoteToType<i32>>>,
-  CCIfType<[i32, f32, i16, f16, v2i16, v2f16, bf16, v2bf16], CCAssignToReg<[
-    VGPR0, VGPR1, VGPR2, VGPR3, VGPR4, VGPR5, VGPR6, VGPR7,
-    VGPR8, VGPR9, VGPR10, VGPR11, VGPR12, VGPR13, VGPR14, VGPR15,
-    VGPR16, VGPR17, VGPR18, VGPR19, VGPR20, VGPR21, VGPR22, VGPR23,
-    VGPR24, VGPR25, VGPR26, VGPR27, VGPR28, VGPR29, VGPR30, VGPR31]>>,
+  CCIfType<[i32, f32, i16, f16, v2i16, v2f16, bf16, v2bf16], CCAssignToReg<
+    !foreach(i, !range(0, 32), !cast<Register>("VGPR"#i))  // VGPR0-31
+  >>,
 ]>;
 
 def CC_AMDGPU : CallingConv<[