[BOLT][test] Removed the use of parentheses in BOLT tests with lit internal shell (#105720)

This patch addresses compatibility issues with the lit internal shell by
removing the use of subshell execution (parentheses and subshell syntax)
in the `BOLT` tests. The lit internal shell does not support
parentheses, so the tests have been refactored to use separate command
invocations, with outputs redirected to temporary files where necessary.

This change is relevant for enabling the lit internal shell by default,
as outlined in [[RFC] Enabling the Lit Internal Shell by
Default](https://discourse.llvm.org/t/rfc-enabling-the-lit-internal-shell-by-default/80179)

fixes: #102401

Author: Harini0924

bolt/test/X86/end-symbol.test

@@ -1,7 +1,9 @@
 # RUN: yaml2obj %p/Inputs/plt-sec.yaml &> %t.exe
 # RUN: llvm-bolt %t.exe -o %t.out
-# RUN: (llvm-readelf --program-headers %t.out | grep LOAD | tail -n 1 ; llvm-nm %t.out) \
-# RUN:   | FileCheck %s
+
+# RUN: llvm-readelf --program-headers %t.out | grep LOAD | tail -n 1 > %t.load
+# RUN: llvm-nm %t.out >> %t.load
+# RUN: FileCheck %s < %t.load
 
 ## Check that llvm-bolt correctly updates _end symbol to match the end of the
 ## last loadable segment.

bolt/test/X86/instrumentation-eh_frame_hdr.cpp

@@ -6,8 +6,9 @@
 // RUN: %clangxx %cxxflags -static -Wl,-q %s -o %t.exe -Wl,--entry=_start
 // RUN: llvm-bolt %t.exe -o %t.instr -instrument \
 // RUN:   --instrumentation-file=%t.fdata -instrumentation-sleep-time=1
-// RUN: (llvm-readelf -SW %t.instr | grep -v bolt; llvm-readelf -lW %t.instr | \
-// RUN:   grep LOAD | tail -n 1) | FileCheck %s
+// RUN: llvm-readelf -SW %t.instr | grep -v bolt > %t.sections
+// RUN: llvm-readelf -lW %t.instr | grep LOAD | tail -n 1 >> %t.sections
+// RUN: FileCheck %s < %t.sections
 
 // CHECK: {{.*}} .eh_frame_hdr PROGBITS [[#%x, EH_ADDR:]]
 // CHECK: LOAD 0x[[#%x, LD_OFFSET:]] 0x[[#%x, LD_VADDR:]] 0x[[#%x, LD_FSIZE:]]