Use inline asm for debugbreak on linux to remove stack frames

* raise() adds several stack frames in debug builds, and even an inline function
  will too, regardless of always_inline status.

renderdoc/common/common.h

@@ -42,11 +42,24 @@
 #include <signal.h>
 
 #define __PRETTY_FUNCTION_SIGNATURE__ __PRETTY_FUNCTION__
+
 #if ENABLED(RDOC_SWITCH)
+
 #include <stdlib.h>
 #define OS_DEBUG_BREAK() abort()
+
+#elif ENABLED(RDOC_LINUX)
+
+#define OS_DEBUG_BREAK()           \
+  do                               \
+  {                                \
+    __asm__ volatile("int $0x03"); \
+  } while((void)0, 0)
+
 #else
+
 #define OS_DEBUG_BREAK() raise(SIGTRAP)
+
 #endif
 
 #if defined(__clang__)

renderdoc/os/os_specific.h

@@ -464,7 +464,6 @@ void Shutdown();
 namespace OSUtility
 {
 inline void ForceCrash();
-inline void DebugBreak();
 bool DebuggerPresent();
 enum
 {

renderdoc/os/posix/posix_specific.h

@@ -82,10 +82,6 @@ inline void ForceCrash()
 {
   __builtin_trap();
 }
-inline void DebugBreak()
-{
-  raise(SIGTRAP);
-}
 bool DebuggerPresent();
 };
 

renderdoc/os/win32/win32_specific.h

@@ -49,10 +49,6 @@ inline void ForceCrash()
 {
   *((int *)NULL) = 0;
 }
-inline void DebugBreak()
-{
-  __debugbreak();
-}
 inline bool DebuggerPresent()
 {
   return ::IsDebuggerPresent() == TRUE;