commit 42d9daca7dadc388d058581d50bd3af1a313a995
author Joel Stanley <joel@jms.id.au> Thu Jun 22 13:31:58 2017 +0930
committer Joel Stanley <joel@jms.id.au> Tue Jun 27 11:13:52 2017 +0930
tree fe032719bdb7a778e7314eb5752cd4f20ed17f19
parent 79aae65c0c3a8a1dd5038be3d1aa88addd37fd09

hostboot: Add patches to fix cmpi assembly

This is change is a noop with the existing toolchain. We change from
implicitly generating the cmpwi to explicitly stating in for
compatibility with newer toolchains.

The patch has been applied to the master branch of hostboot. The P8
backport is pending review.

With gcc 4.9.3, binutils 2.25.2:
```
$ cat asm-test.S
.text
.global test
        cmpi 0, 8, 1
$ /opt/cross/gcc-4.9.3-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc -c asm-test.S
$ objdump -d asm-test.o
0000000000000000 <.text>:
   0:	2c 08 00 01 	cmpwi   r8,1
```

Old toolchain, updated instruction:
```
$ cat asm-test.S
.text

.global test
        cmpwi 0, 8, 1
$ /opt/cross/gcc-4.9.3-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc -c asm-test.S
$ objdump -d asm-test.o
0000000000000000 <.text>:
   0:	2c 08 00 01 	cmpwi   r8,1
```

And then the new toolchain (gcc 6.3.0, binutils 2.28) with the updated asm:
```
$ cat asm-test.S
.text

.global test
        cmpwi 0, 8, 1
$ powerpc64-linux-gnu-gcc -c asm-test.S
$ objdump -d asm-test.o
0000000000000000 <.text>:
   0:	2c 08 00 01 	cmpwi   r8,1
```

Signed-off-by: Joel Stanley <joel@jms.id.au>