Use FileCheck's --input-file option instead of cat|

Author: TiborGY

llvm/test/Transforms/PartiallyInlineLibCalls/X86/good-prototype.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -S -passes=partially-inline-libcalls -mtriple=x86_64-unknown-linux-gnu -pass-remarks=partially-inline-libcalls \
 ; RUN:     -pass-remarks-missed=partially-inline-libcalls 2>%t < %s | FileCheck %s
-; RUN: cat %t | FileCheck %s -check-prefix=CHECK-REMARK
+; RUN: FileCheck %s -check-prefix=CHECK-REMARK --input-file=%t
 
 define float @f(float %val) {
 ; CHECK-LABEL: @f(

llvm/test/Transforms/PartiallyInlineLibCalls/X86/musttail.ll

@@ -1,6 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -S -passes=partially-inline-libcalls -mtriple=x86_64-unknown-linux-gnu -pass-remarks-missed=partially-inline-libcalls 2>%t < %s | FileCheck %s
-; RUN: cat %t | FileCheck %s -check-prefix=CHECK-REMARK
+; RUN: FileCheck %s -check-prefix=CHECK-REMARK --input-file=%t
 
 define double @foo(double %x) {
 ; CHECK-LABEL: @foo(

llvm/test/Transforms/PartiallyInlineLibCalls/strictfp.ll

@@ -1,5 +1,5 @@
 ; RUN: opt -S -passes=partially-inline-libcalls -mtriple=x86_64-unknown-linux-gnu -pass-remarks-missed=partially-inline-libcalls 2>%t < %s | FileCheck %s
-; RUN: cat %t | FileCheck %s -check-prefix=CHECK-REMARK
+; RUN: FileCheck %s -check-prefix=CHECK-REMARK --input-file=%t
 
 define float @f(float %val) strictfp {
 ; CHECK-LABEL: @f