[Arm builtins] Remove non-necessary IS check

This patch removes the instruction set check to make the msr APSR_nzcvq,
ip instruction only execute if Thumb2 is used.
The APSR is a subset of the bits of the CPSR
(B.1.3.3 of the Arm v7 A and R ARM [1]) and is only available for A and
R profiles.
However in section B.9.3.11 of the same document we see that:

"In the A and R profiles, APSR_nzcvq is the same as CPSR_f"
"ARM recommends the APSR forms when only the N, Z, C, V, Q, and GE[3:0]
bits are being written."

This patch also make those files assemble for Armv8-M Mainline
architecture profile.

The builtins were cross-compiled for Arm, Aarch64 and Armv6-M, Armv7-M
and Armv7E-M targets.
Cross-compiled tests were executed for Arm target.

[1]: https://developer.arm.com/docs/ddi0406/latest/arm-architecture-reference-manual-armv7-a-and-armv7-r-edition

Patch by hug-dev (Hugues de Valon).

Differential Revision: https://reviews.llvm.org/D51854



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@343601 91177308-0d34-0410-b5e6-96231b3b80d8

lib/builtins/arm/aeabi_cdcmp.S

@@ -55,7 +55,7 @@ DEFINE_COMPILERRT_FUNCTION(__aeabi_cdcmpeq)
         mov ip, #APSR_C
         msr APSR_nzcvq, ip
 #else
-        msr CPSR_f, #APSR_C
+        msr APSR_nzcvq, #APSR_C
 #endif
         JMP(lr)
 #endif
@@ -115,11 +115,7 @@ DEFINE_COMPILERRT_FUNCTION(__aeabi_cdcmple)
         movne ip, #(APSR_C)
 
 1:
-#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
         msr APSR_nzcvq, ip
-#else
-        msr CPSR_f, ip
-#endif
         pop {r0-r3}
         POP_PC()
 #endif

lib/builtins/arm/aeabi_cfcmp.S

@@ -55,7 +55,7 @@ DEFINE_COMPILERRT_FUNCTION(__aeabi_cfcmpeq)
         mov ip, #APSR_C
         msr APSR_nzcvq, ip
 #else
-        msr CPSR_f, #APSR_C
+        msr APSR_nzcvq, #APSR_C
 #endif
         JMP(lr)
 #endif
@@ -115,11 +115,7 @@ DEFINE_COMPILERRT_FUNCTION(__aeabi_cfcmple)
         movne ip, #(APSR_C)
 
 1:
-#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
         msr APSR_nzcvq, ip
-#else
-        msr CPSR_f, ip
-#endif
         pop {r0-r3}
         POP_PC()
 #endif