add explicit alignment directives to assure arm code is 4-byte aligned

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@102030 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/arm/ltdf2vfp.S b/lib/arm/ltdf2vfp.S
index 15a799b..55dfd80 100644
--- a/lib/arm/ltdf2vfp.S
+++ b/lib/arm/ltdf2vfp.S
@@ -16,6 +16,7 @@
 // Uses Darwin calling convention where double precision arguments are passsed 
 // like in GPR pairs.
 //
+	.align 2
 DEFINE_COMPILERRT_FUNCTION(__ltdf2vfp)
 	fmdrr	d6, r0, r1	// load r0/r1 pair in double register
 	fmdrr	d7, r2, r3	// load r2/r3 pair in double register