quantization: Extract union to a named type

This mostly helps clang-format that, in absence of a separate properly
formatted declaration, tries to format the union as several lines.

Author: zeux

Diff for: src/quantization.cpp

@@ -3,9 +3,15 @@
 
 #include <assert.h>
 
+union FloatBits
+{
+	float f;
+	unsigned int ui;
+};
+
 unsigned short meshopt_quantizeHalf(float v)
 {
-	union { float f; unsigned int ui; } u = {v};
+	FloatBits u = {v};
 	unsigned int ui = u.ui;
 
 	int s = (ui >> 16) & 0x8000;
@@ -30,7 +36,7 @@ float meshopt_quantizeFloat(float v, int N)
 {
 	assert(N >= 0 && N <= 23);
 
-	union { float f; unsigned int ui; } u = {v};
+	FloatBits u = {v};
 	unsigned int ui = u.ui;
 
 	const int mask = (1 << (23 - N)) - 1;
@@ -64,7 +70,7 @@ float meshopt_dequantizeHalf(unsigned short h)
 	// 112 is an exponent bias fixup; since we already applied it once, applying it twice converts 31 to 255
 	r += (em >= (31 << 10)) ? (112 << 23) : 0;
 
-	union { float f; unsigned int ui; } u;
+	FloatBits u;
 	u.ui = s | r;
 	return u.f;
 }