[x86] Synchronize fp128 and i128 ABI tests (nfc)

The ABI tests for fp128 covers a handful of things that the i128 test
currently does not, including targets other than x86-64 Linux and some
simpler argument cases. Update the i128 test to be consistent with
fp128. All existing test function patterns still exist, though they all
wind up renamed.

Additionally correct some `call` signatures in the fp128 test (not
relevant for output).

Author: tgross35

llvm/test/CodeGen/X86/fp128-abi.ll

@@ -1,5 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 
+; Consider keeping tests in sync with i128-abi.ll
+
 ; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -verify-machineinstrs | FileCheck %s --check-prefix=CHECK-X64
 ; RUN: llc < %s -mtriple=i686-unknown-linux-gnu -verify-machineinstrs | FileCheck %s --check-prefix=CHECK-X86
 ; RUN: llc < %s -mtriple=x86_64-pc-windows-msvc -verify-machineinstrs | FileCheck %s --check-prefix=CHECK-MSVC64
@@ -360,7 +362,7 @@ define void @call_first_arg(fp128 %x) nounwind {
 ; CHECK-MINGW-NEXT:    callq first_arg
 ; CHECK-MINGW-NEXT:    addq $56, %rsp
 ; CHECK-MINGW-NEXT:    retq
-  call i128 @first_arg(fp128 %x)
+  call fp128 @first_arg(fp128 %x)
   ret void
 }
 
@@ -452,7 +454,7 @@ define void @call_leading_args(fp128 %x) nounwind {
 ; CHECK-MINGW-NEXT:    callq leading_args
 ; CHECK-MINGW-NEXT:    addq $72, %rsp
 ; CHECK-MINGW-NEXT:    retq
-  call i128 @leading_args(i64 0, i64 0, i64 0, i64 0, fp128 %x)
+  call fp128 @leading_args(i64 0, i64 0, i64 0, i64 0, fp128 %x)
   ret void
 }
 
@@ -562,7 +564,7 @@ define void @call_many_leading_args(fp128 %x) nounwind {
 ; CHECK-MINGW-NEXT:    callq many_leading_args
 ; CHECK-MINGW-NEXT:    addq $88, %rsp
 ; CHECK-MINGW-NEXT:    retq
-  call i128 @many_leading_args(i64 0, i64 0, i64 0, i64 0, fp128 0xL0, fp128 %x)
+  call fp128 @many_leading_args(i64 0, i64 0, i64 0, i64 0, fp128 0xL0, fp128 %x)
   ret void
 }
 
@@ -654,6 +656,6 @@ define void @call_trailing_arg(fp128 %x) nounwind {
 ; CHECK-MINGW-NEXT:    callq trailing_arg
 ; CHECK-MINGW-NEXT:    addq $72, %rsp
 ; CHECK-MINGW-NEXT:    retq
-  call i128 @trailing_arg(i64 0, i64 0, i64 0, i64 0, fp128 %x)
+  call fp128 @trailing_arg(i64 0, i64 0, i64 0, i64 0, fp128 %x)
   ret void
 }