math: move x86_64 (l)lrint(f) functions to C with inline asm

src/math/x86_64/llrint.c

+#include <math.h>
+
+long long llrint(double x)
+{
+	long long r;
+	__asm__ ("cvtsd2si %1, %0" : "=r"(r) : "x"(x));
+	return r;
+}

src/math/x86_64/llrint.s

-.global llrint
-.type llrint,@function
-llrint:
-	cvtsd2si %xmm0,%rax
-	ret

src/math/x86_64/llrintf.c

+#include <math.h>
+
+long long llrintf(float x)
+{
+	long long r;
+	__asm__ ("cvtss2si %1, %0" : "=r"(r) : "x"(x));
+	return r;
+}

src/math/x86_64/llrintf.s

-.global llrintf
-.type llrintf,@function
-llrintf:
-	cvtss2si %xmm0,%rax
-	ret

src/math/x86_64/lrint.c

+#include <math.h>
+
+long lrint(double x)
+{
+	long r;
+	__asm__ ("cvtsd2si %1, %0" : "=r"(r) : "x"(x));
+	return r;
+}

src/math/x86_64/lrint.s

-.global lrint
-.type lrint,@function
-lrint:
-	cvtsd2si %xmm0,%rax
-	ret

src/math/x86_64/lrintf.c

+#include <math.h>
+
+long lrintf(float x)
+{
+	long r;
+	__asm__ ("cvtss2si %1, %0" : "=r"(r) : "x"(x));
+	return r;
+}

src/math/x86_64/lrintf.s

-.global lrintf
-.type lrintf,@function
-lrintf:
-	cvtss2si %xmm0,%rax
-	ret