EmulatorPkg/Unix/Host: Fix symbol loading with clang

Fix symbol loading issues with clang compilers where
SecGdbSciptBreak() is optimized away and the gdb/lldb
breakpoint on that symbol is never hit and no symbols
are loaded for any modules.

Update the implementation of SecGdbScriptBreak() so it
is never inlined and add code to the implementation
of SecGdbScriptBreak() to guarantee that the entire
function is never optimized away by using a volatile
loop variable.

Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>

EmulatorPkg/Unix/Host/Host.c

@@ -1112,9 +1112,7 @@ DlLoadImage (
  #endif
 }
 
-#ifdef __APPLE__
 __attribute__ ((noinline))
-#endif
 VOID
 SecGdbScriptBreak (
   char               *FileName,
@@ -1123,6 +1121,17 @@ SecGdbScriptBreak (
   int                AddSymbolFlag
   )
 {
+  volatile UINTN  Index;
+
+  //
+  // Disable inline and have this function do some work to prevent
+  // optimizing this function away. It must always be in symbol table to
+  // set breakpoint for gdb script to run, load symbols, and set pending
+  // breakpoints.
+  //
+  for (Index = 0; Index < 1; Index++) {
+  }
+
   return;
 }