TLS.h: Drop inline assembly from the header.

This was a holdover from BeOS, which did this as inline assembly.
We do not on any platform other than 32-bit x86, and even there
we may have preferred to do things a little differently on non-BeOS
ABIs.

Most things ported from other systems, or even native apps, are going to
use _Thread_local variables anyway, which will bypass this system
altogether.

headers/os/support/TLS.h

@@ -1,12 +1,11 @@
 /*
- * Copyright 2003-2007 Haiku, Inc. All rights reserved.
+ * Copyright 2003-2021, Haiku, Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _TLS_H
 #define _TLS_H
 
 
-#include <BeBuild.h>
 #include <SupportDefs.h>
 
 
@@ -22,46 +21,10 @@ extern "C" {
 #endif	/* __cplusplus */
 
 extern int32 tls_allocate(void);
-
-#if !_NO_INLINE_ASM && __i386__ && __GNUC__
-
-static inline void *
-tls_get(int32 index)
-{
-	void *ret;
-	__asm__ __volatile__ ( 
-		"movl	%%fs:(, %1, 4), %0"
-		: "=r" (ret) : "r" (index));
-	return ret;
-}
-
-static inline void **
-tls_address(int32 index)
-{
-	void **ret;
-	__asm__ __volatile__ ( 
-		"movl	%%fs:0, %0\n\t"
-		"leal	(%0, %1, 4), %0\n\t"
-		: "=&r" (ret) : "r" (index));
-	return ret;
-}
-
-static inline void
-tls_set(int32 index, void *value)
-{
-	__asm__ __volatile__ ( 
-		"movl	%1, %%fs:(, %0, 4)"
-		: : "r" (index), "r" (value));
-}
-
-#else	/* !_NO_INLINE_ASM && __i386__ && __GNUC__ */
-
 extern void *tls_get(int32 index);
 extern void **tls_address(int32 index);
 extern void tls_set(int32 index, void *value);
 
-#endif	/* !_NO_INLINE_ASM && __i386__ && __GNUC__ */
-
 #ifdef __cplusplus
 }
 #endif	/* __cplusplus */