[compiler-rt] Mark `int_lib.h` builtins as `static` (PR #69305)

[via llvm-commits]

https://github.com/trevyn created https://github.com/llvm/llvm-project/pull/69305

Mark the following symbols as `static` to prevent duplicate definitions:

`__builtin_ctz`
`__builtin_clz`
`__builtin_clzll`
`__builtin_sadd_overflow`

>Without these then all of these functions show up in all object files which include int_lib.h on Windows. This'll help prevent duplicate symbols by ensuring they're not exported.

See:

https://github.com/rust-lang/compiler-builtins/issues/167
https://reviews.llvm.org/D34599

>From 53c004b2a06e429b005c6e9edda0cad5ee150aaa Mon Sep 17 00:00:00 2001
From: trevyn <230691+trevyn at users.noreply.github.com>
Date: Tue, 17 Oct 2023 11:59:21 +0300
Subject: [PATCH] Mark int_lib definitions as `static`

---
 compiler-rt/lib/builtins/int_lib.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/compiler-rt/lib/builtins/int_lib.h b/compiler-rt/lib/builtins/int_lib.h
index 04ea2d910574bcf..f6c1b7cff4b99b5 100644
--- a/compiler-rt/lib/builtins/int_lib.h
+++ b/compiler-rt/lib/builtins/int_lib.h
@@ -119,14 +119,14 @@ COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int *rem);
 #if defined(_MSC_VER) && !defined(__clang__)
 #include <intrin.h>
 
-int __inline __builtin_ctz(uint32_t value) {
+static int __inline __builtin_ctz(uint32_t value) {
   unsigned long trailing_zero = 0;
   if (_BitScanForward(&trailing_zero, value))
     return trailing_zero;
   return 32;
 }
 
-int __inline __builtin_clz(uint32_t value) {
+static int __inline __builtin_clz(uint32_t value) {
   unsigned long leading_zero = 0;
   if (_BitScanReverse(&leading_zero, value))
     return 31 - leading_zero;
@@ -134,14 +134,14 @@ int __inline __builtin_clz(uint32_t value) {
 }
 
 #if defined(_M_ARM) || defined(_M_X64)
-int __inline __builtin_clzll(uint64_t value) {
+static int __inline __builtin_clzll(uint64_t value) {
   unsigned long leading_zero = 0;
   if (_BitScanReverse64(&leading_zero, value))
     return 63 - leading_zero;
   return 64;
 }
 #else
-int __inline __builtin_clzll(uint64_t value) {
+static int __inline __builtin_clzll(uint64_t value) {
   if (value == 0)
     return 64;
   uint32_t msh = (uint32_t)(value >> 32);
@@ -154,7 +154,7 @@ int __inline __builtin_clzll(uint64_t value) {
 
 #define __builtin_clzl __builtin_clzll
 
-bool __inline __builtin_sadd_overflow(int x, int y, int *result) {
+static bool __inline __builtin_sadd_overflow(int x, int y, int *result) {
   if ((x < 0) != (y < 0)) {
     *result = x + y;
     return false;