Mark __BIONIC_WEAK_FOR_NATIVE_BRIDGE symbols

To make it easier for Native Bridge implementations
to override these symbols.

Bug: http://b/67993967
Test: make
Change-Id: I4c53e53af494bca365dd2b3305ab0ccc2b23ba44
diff --git a/libc/arch-arm/bionic/setjmp.S b/libc/arch-arm/bionic/setjmp.S
index 6ee162e..b814124 100644
--- a/libc/arch-arm/bionic/setjmp.S
+++ b/libc/arch-arm/bionic/setjmp.S
@@ -76,11 +76,13 @@
 #define _JB_CHECKSUM    (_JB_CORE_BASE+10)
 
 ENTRY(setjmp)
+__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(setjmp)
   mov r1, #1
   b sigsetjmp
 END(setjmp)
 
 ENTRY(_setjmp)
+__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(_setjmp)
   mov r1, #0
   b sigsetjmp
 END(_setjmp)
@@ -117,6 +119,7 @@
 
 // int sigsetjmp(sigjmp_buf env, int save_signal_mask);
 ENTRY(sigsetjmp)
+__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(sigsetjmp)
   stmfd sp!, {r0, lr}
   .cfi_def_cfa_offset 8
   .cfi_rel_offset r0, 0
@@ -191,6 +194,7 @@
 
 // void siglongjmp(sigjmp_buf env, int value);
 ENTRY(siglongjmp)
+__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(siglongjmp)
   stmfd sp!, {r0, r1, lr}
   .cfi_def_cfa_offset 12
   .cfi_rel_offset r0, 0
@@ -262,4 +266,6 @@
 END(siglongjmp)
 
 ALIAS_SYMBOL(longjmp, siglongjmp)
+__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(longjmp)
 ALIAS_SYMBOL(_longjmp, siglongjmp)
+__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(_longjmp)
diff --git a/libc/arch-arm/bionic/vfork.S b/libc/arch-arm/bionic/vfork.S
index 1b7cbad..8329111 100644
--- a/libc/arch-arm/bionic/vfork.S
+++ b/libc/arch-arm/bionic/vfork.S
@@ -29,6 +29,7 @@
 #include <private/bionic_asm.h>
 
 ENTRY(vfork)
+__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(vfork)
     // __get_tls()[TLS_SLOT_THREAD_ID]->cached_pid_ = 0
     mrc     p15, 0, r3, c13, c0, 3
     ldr     r3, [r3, #4]