Fix casting a pointer to an integer safely.

Only casting from an integer (any size) to a pointer using reinterpret_cast<>
is well-defined. Casting a pointer to an integer needs a large enough integer.

Bug 29894961

Change-Id: I51cf6923f4feeaf1860ca0565aa7d40b61918e67
Reviewed-on: https://swiftshader-review.googlesource.com/5750
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/OpenGL/libEGL/libEGL.cpp

diff --git a/src/OpenGL/libEGL/libEGL.cpp b/src/OpenGL/libEGL/libEGL.cpp
index 297ef6c..9174558 100644
--- a/src/OpenGL/libEGL/libEGL.cpp
+++ b/src/OpenGL/libEGL/libEGL.cpp
@@ -989,7 +989,7 @@
 		}
 	#endif
 
-	GLuint name = reinterpret_cast<GLuint>(buffer);
+	GLuint name = static_cast<GLuint>(reinterpret_cast<uintptr_t>(buffer));
 
 	if(name == 0)
 	{