[BOLT][test] Add missing stderr redirections

[Amir]

Summary

BOLT-ERROR and BOLT-WARNING messages are output to stderr which is not captured
by piping to FileCheck. Redirect stderr to stdout to fix that in tests.

bolt/test/X86/issue26.s

 # This reproduces issue 26 from our github repo
 #  BOLT fails with the following assertion:
 #    llvm/tools/llvm-bolt/src/BinaryFunction.cpp:2950: void llvm::bolt::BinaryFunction::postProcessBranches(): Assertion `validateCFG() && "invalid CFG"' failed.
 
 # REQUIRES: system-linux
 
 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
 # RUN:   %s -o %t.o
 # RUN: %clang %cflags %t.o -o %t.exe -Wl,-q
-# RUN: llvm-bolt %t.exe --relocs --print-cfg -o %t.out \
+# RUN: llvm-bolt %t.exe --relocs --print-cfg -o %t.out 2>&1 \
 # RUN:    | FileCheck %s
 
 # CHECK-NOT: BOLT-WARNING: CFG invalid in XYZ @ .LBB0
 
 # CHECK: Binary Function "XYZ"
 
 # CHECK: .Ltmp{{.*}} (1 instructions, align : 1)
 # CHECK-NEXT: Secondary Entry Point: FUNCat{{.*}}

bolt/test/X86/issue26.test

 # This reproduces issue 26 from our github repo
 
 # RUN: yaml2obj %p/Inputs/issue26.yaml &> %t.exe
-# RUN: llvm-bolt %t.exe --relocs --print-cfg -o %t.out \
+# RUN: llvm-bolt %t.exe --relocs --print-cfg -o %t.out 2>&1 \
 # RUN:    | FileCheck %s
 
 CHECK-NOT: BOLT-WARNING: CFG invalid in XYZ @ .LBB0
 
 CHECK: Binary Function "XYZ"
 
 CHECK: .Ltmp0 (1 instructions, align : 1)
 CHECK-NEXT: Secondary Entry Point: FUNCat0x4004e9

bolt/test/runtime/X86/exceptions-instrumentation.test

 # Check instrumentation of C++ code with exceptions
 
 REQUIRES: system-linux,bolt-runtime
 
 RUN: %clangxx %cxxflags -no-pie %p/Inputs/exceptions_split.cpp -Wl,-q -g -o %t_exc_split
 RUN: llvm-bolt %t_exc_split -o %t.exc --instrument --instrumentation-file=%t.fdata
 
 RUN: %t.exc arg1 arg2 arg3
 
 RUN: llvm-bolt %t_exc_split -o %t.exc.bolted --data %t.fdata \
 RUN:   --reorder-blocks=ext-tsp --reorder-functions=hfsort+ \
-RUN:   --split-functions --split-eh=1 \
+RUN:   --split-functions --split-eh=1 2>&1 \
 RUN:   | FileCheck --check-prefix=EXCEPTIONS %s
 EXCEPTIONS-NOT: invalid (possibly stale) profile
 
 # Check that cold symbols are emitted with local binding.
 RUN: llvm-readelf -Ws %t.exc.bolted | FileCheck %s --check-prefix=CHECK-READELF
 CHECK-READELF: FUNC    LOCAL  DEFAULT   {{.*}} main.cold.{{.*}}
 
 RUN: cat %t.fdata | FileCheck --check-prefix=EXCEPTIONS-FDATA %s
 # Check that the printf "catch" ran exactly 10 times
 EXCEPTIONS-FDATA: 1 main {{.*}} 1 _Znwm@PLT 0 0 10

bolt/test/runtime/meta-merge-fdata.test

 # Check unmapped calls coverage - libc should be calling _start via
 # uninstrumented code
 RUN: cat %t.fdata1 | FileCheck %s --check-prefix=CHECK-FDATA
 CHECK-FDATA: 0 [unknown] 0 1 _start 0 0 1
 
 # Check that BOLT works with this profile
 RUN: llvm-bolt merge-fdata -o %t.bolt --data %t.fdata1 \
 RUN:   --reorder-blocks=ext-tsp --reorder-functions=hfsort+ \
-RUN:   --split-functions \
+RUN:   --split-functions 2>&1 \
 RUN:   | FileCheck %s --check-prefix=CHECK-BOLT1
 CHECK-BOLT1-NOT: invalid (possibly stale) profile
 
 # Execute again
 RUN: %t.inst --help
 RUN: mv %t.fdata %t.fdata2
 
 # Check profile coverage
 RUN: llvm-boltdiff merge-fdata merge-fdata \
 RUN:   --data %t.fdata1 --data2 %t.fdata2 --display-count=20 | \
 RUN:   FileCheck %s --check-prefix=CHECK-BOLTDIFF
 CHECK-BOLTDIFF: Inputs share [[#]] functions
 
 # Check that instrumented binary produces the same result
 RUN: merge-fdata %t.fdata1 %t.fdata2 > %t.fdata.base
 RUN: %t.inst %t.fdata1 %t.fdata2 > %t.fdata.inst
 RUN: cmp %t.fdata.base %t.fdata.inst
 
 # Optimize using merged fdata
 RUN: llvm-bolt merge-fdata -o %t.opt --data %t.fdata.base \
 RUN:   --reorder-blocks=ext-tsp --reorder-functions=hfsort+ \
-RUN:   --split-functions \
+RUN:   --split-functions 2>&1 \
 RUN:   | FileCheck %s --check-prefix=CHECK-BOLT2
 CHECK-BOLT2-NOT: invalid (possibly stale) profile
 
 # Check that optimized binary produces the same result
 RUN: %t.opt %t.fdata1 %t.fdata2 > %t.fdata.opt
 RUN: cmp %t.fdata.base %t.fdata.opt