JIT: Delete some unused fields in CallArgABIInformation (#99972)

Author: jakobbotsch

src/coreclr/jit/gentree.h

@@ -4435,10 +4435,6 @@ struct CallArgABIInformation
         , ByteOffset(0)
         , ByteSize(0)
         , ByteAlignment(0)
-#ifdef UNIX_AMD64_ABI
-        , StructIntRegs(0)
-        , StructFloatRegs(0)
-#endif
 #if defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)
         , StructFloatFieldType()
 #endif
@@ -4474,8 +4470,6 @@ struct CallArgABIInformation
     // Unix amd64 will split floating point types and integer types in structs
     // between floating point and general purpose registers. Keep track of that
     // information so we do not need to recompute it later.
-    unsigned                                            StructIntRegs;
-    unsigned                                            StructFloatRegs;
     SYSTEMV_AMD64_CORINFO_STRUCT_REG_PASSING_DESCRIPTOR StructDesc;
 #endif // UNIX_AMD64_ABI
 #if defined(TARGET_LOONGARCH64) || defined(TARGET_RISCV64)

src/coreclr/jit/morph.cpp

@@ -2844,8 +2844,6 @@ void CallArgs::AddFinalArgsAndDetermineABIInfo(Compiler* comp, GenTreeCall* call
             arg.AbiInfo.NumRegs = size;
             arg.AbiInfo.SetByteSize(byteSize, argAlignBytes, isStructArg, isFloatHfa);
 #ifdef UNIX_AMD64_ABI
-            arg.AbiInfo.StructIntRegs   = structIntRegs;
-            arg.AbiInfo.StructFloatRegs = structFloatRegs;
 
             if (isStructArg)
             {