[llvm] [BOLT] Don't create function entry points for unnamed symbols (PR #68977)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->

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``````````bash
git-clang-format --diff dbb9faedec5e28ab3f584f5e14d31e475ac268ac 3d346a4138d2edfddef726d9bd933eb15b70d5bd -- bolt/test/RISCV/unnamed-sym-no-entry.c bolt/lib/Rewrite/RewriteInstance.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/bolt/test/RISCV/unnamed-sym-no-entry.c b/bolt/test/RISCV/unnamed-sym-no-entry.c
index 57ba292fe..5d654026d 100644
--- a/bolt/test/RISCV/unnamed-sym-no-entry.c
+++ b/bolt/test/RISCV/unnamed-sym-no-entry.c
@@ -5,8 +5,9 @@
 
 /// Verify that the binary indeed contains an unnamed symbol at _start
 // RUN: llvm-readelf -s %t | FileCheck %s --check-prefix=CHECK-ELF
-// CHECK-ELF-DAG: [[#%x,START:]] {{.*}} FUNC GLOBAL DEFAULT [[#%d,SECTION:]] _start{{$}}
-// CHECK-ELF-DAG: [[#%x,START]] {{.*}} NOTYPE LOCAL DEFAULT [[#SECTION]] {{$}}
+// CHECK-ELF-DAG: [[#%x,START:]] {{.*}} FUNC GLOBAL DEFAULT [[#%d,SECTION:]]
+// _start{{$}} CHECK-ELF-DAG: [[#%x,START]] {{.*}} NOTYPE LOCAL DEFAULT
+// [[#SECTION]] {{$}}
 
 /// Verify that BOLT did not create an extra entry point for the unnamed symbol
 // RUN: llvm-bolt -o %t.bolt %t --print-cfg | FileCheck %s

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https://github.com/llvm/llvm-project/pull/68977