[OpenMP] Provide __kmp_unnamed_critical_addr on SPARC (llvm#138517)

`libomp.so` currently fails to link on SPARC, both Solaris/sparcv9 and
Linux/sparc64:

```
Undefined                       first referenced
 symbol                             in file
__kmp_unnamed_critical_addr         projects/openmp/runtime/src/CMakeFiles/omp.dir/kmp_gsupport.cpp.o
ld: fatal: symbol referencing errors
```

This patch provides the necessary definition. While at it, I noticed
that on non-x86 targets the symbol wasn't marked as `@object`, which
this patch corrects, too.

Tested on `sparcv9-sun-solaris2.11`, `sparc64-unknown-linux-gnu`,
`amd64-pc-solaris2.11`, and `x86_64-pc-linux-gnu`.

Author: rorth

openmp/runtime/src/z_Linux_asm.S

@@ -2470,7 +2470,7 @@ __kmp_invoke_microtask:
 
 #endif /* KMP_ARCH_S390X */
 
-#if KMP_ARCH_ARM || KMP_ARCH_MIPS || KMP_ARCH_PPC || KMP_ARCH_AARCH64_32
+#if KMP_ARCH_ARM || KMP_ARCH_MIPS || KMP_ARCH_PPC || KMP_ARCH_AARCH64_32 || KMP_ARCH_SPARC32
 #ifndef KMP_PREFIX_UNDERSCORE
 # define KMP_PREFIX_UNDERSCORE(x) x
 #endif
@@ -2482,13 +2482,14 @@ __kmp_invoke_microtask:
 KMP_PREFIX_UNDERSCORE(__kmp_unnamed_critical_addr):
     .4byte .gomp_critical_user_
 #ifdef __ELF__
+    .type KMP_PREFIX_UNDERSCORE(__kmp_unnamed_critical_addr),@object
     .size KMP_PREFIX_UNDERSCORE(__kmp_unnamed_critical_addr),4
 #endif
-#endif /* KMP_ARCH_ARM || KMP_ARCH_MIPS || KMP_ARCH_AARCH64_32 */
+#endif /* KMP_ARCH_ARM || KMP_ARCH_MIPS || KMP_ARCH_AARCH64_32 || KMP_ARCH_SPARC32 */
 
 #if KMP_ARCH_PPC64 || KMP_ARCH_AARCH64 || KMP_ARCH_MIPS64 ||                   \
     KMP_ARCH_RISCV64 || KMP_ARCH_LOONGARCH64 || KMP_ARCH_VE ||                 \
-    KMP_ARCH_S390X
+    KMP_ARCH_S390X || KMP_ARCH_SPARC64
 #ifndef KMP_PREFIX_UNDERSCORE
 # define KMP_PREFIX_UNDERSCORE(x) x
 #endif
@@ -2500,11 +2501,12 @@ KMP_PREFIX_UNDERSCORE(__kmp_unnamed_critical_addr):
 KMP_PREFIX_UNDERSCORE(__kmp_unnamed_critical_addr):
     .8byte .gomp_critical_user_
 #ifdef __ELF__
+    .type KMP_PREFIX_UNDERSCORE(__kmp_unnamed_critical_addr),@object
     .size KMP_PREFIX_UNDERSCORE(__kmp_unnamed_critical_addr),8
 #endif
 #endif /* KMP_ARCH_PPC64 || KMP_ARCH_AARCH64 || KMP_ARCH_MIPS64 ||
           KMP_ARCH_RISCV64 || KMP_ARCH_LOONGARCH64 || KMP_ARCH_VE || 
-          KMP_ARCH_S390X */
+          KMP_ARCH_S390X || KMP_ARCH_SPARC64 */
 
 #if KMP_OS_LINUX
 # if KMP_ARCH_ARM || KMP_ARCH_AARCH64