cmd/asm/internal/asm: add aliases for ARM64 condition codes

Add CS as an alias for HS, and CC as an alias for LO, otherwise

	CSINV	CS, R1, R2, R3

was interpreted as

	CSINV	0, R1, R2, R3

Also fix the corresponding faulty test.

Fixes #12632
Updates #12470

Change-Id: I974cfc7e5ced682d4754ba09b0b102cb08a46567
Reviewed-on: https://go-review.googlesource.com/14680Reviewed-by: Rob Pike <r@golang.org>

src/cmd/asm/internal/arch/arch.go

@@ -252,7 +252,9 @@ func archArm64() *Arch {
 	register["EQ"] = arm64.COND_EQ
 	register["NE"] = arm64.COND_NE
 	register["HS"] = arm64.COND_HS
+	register["CS"] = arm64.COND_HS
 	register["LO"] = arm64.COND_LO
+	register["CC"] = arm64.COND_LO
 	register["MI"] = arm64.COND_MI
 	register["PL"] = arm64.COND_PL
 	register["VS"] = arm64.COND_VS

src/cmd/asm/internal/asm/testdata/arm64.out

@@ -37,7 +37,7 @@
 147 00037 (testdata/arm64.s:147)	CSEL	LT, R1, R2, ZR
 148 00038 (testdata/arm64.s:148)	CSINC	GT, R1, ZR, R3
 149 00039 (testdata/arm64.s:149)	CSNEG	MI, R1, R2, R3
-150 00040 (testdata/arm64.s:150)	CSINV	0, R1, R2, R3
+150 00040 (testdata/arm64.s:150)	CSINV	HS, R1, R2, R3
 156 00041 (testdata/arm64.s:156)	CSEL	LT, R1, R2
 164 00042 (testdata/arm64.s:164)	CCMN	MI, ZR, R1, $4
 173 00043 (testdata/arm64.s:173)	FADDD	$(0.5), F1