[Bug 214904] head -r309179 clang 3.9.0 TARGET_ARCH=powerpc64 cross-built buildkernel stops for: rejected assembler notation

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214904

            Bug ID: 214904
           Summary: head -r309179 clang 3.9.0 TARGET_ARCH=powerpc64
                    cross-built buildkernel stops for: rejected assembler
                    notation
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: markmi at dsl-only.net

[To get this far I had to WERROR= to get past other rejections
for some C/C++ sorts of issues.]

Below are some example errors that clang 3.9.0 reports for trying to
handle the assembler notations that are used:

--- hwpmc_e500.o ---
/usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_e500.c:475:19: error:
unrecognized instruction mnemonic
        uint32_t pmgc0 = mfpmr(PMR_PMGC0);
                         ^
./machine/pmc_mdep.h:24:21: note: expanded from macro 'mfpmr'
          __asm __volatile("mfpmr %0,%1" : "=r"(val) : "K"(reg));       \
                           ^
<inline asm>:1:2: note: instantiated into assembly here
        mfpmr 3,400
        ^
/usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_e500.c:478:2: error:
unrecognized instruction mnemonic
        mtpmr(PMR_PMGC0, pmgc0);
        ^
./machine/pmc_mdep.h:21:19: note: expanded from macro 'mtpmr'
        __asm __volatile("mtpmr %0,%1" : : "K"(reg), "r"(val))
                         ^
<inline asm>:1:2: note: instantiated into assembly here
        mtpmr 400,3
        ^
/usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_e500.c:446:2: error:
unrecognized instruction mnemonic
        mtpmr(PMR_PMGC0, PMGC_FAC | PMGC_PMIE | PMGC_FCECE);
        ^
./machine/pmc_mdep.h:21:19: note: expanded from macro 'mtpmr'
        __asm __volatile("mtpmr %0,%1" : : "K"(reg), "r"(val))
                         ^
<inline asm>:1:2: note: instantiated into assembly here
        mtpmr 400,3
        ^
/usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_e500.c:408:14: error:
unrecognized instruction mnemonic
                pmc_pmlc = mfpmr(PMR_PMLCa0);
                           ^
./machine/pmc_mdep.h:24:21: note: expanded from macro 'mfpmr'
          __asm __volatile("mfpmr %0,%1" : "=r"(val) : "K"(reg));       \
                           ^
<inline asm>:1:2: note: instantiated into assembly here
        mfpmr 10,144
        ^
/usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_e500.c:410:3: error:
unrecognized instruction mnemonic
                mtpmr(PMR_PMLCa0, pmc_pmlc);
                ^
./machine/pmc_mdep.h:21:19: note: expanded from macro 'mtpmr'
        __asm __volatile("mtpmr %0,%1" : : "K"(reg), "r"(val))
                         ^
<inline asm>:1:2: note: instantiated into assembly here
        mtpmr 144,10
        ^
/usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_e500.c:413:14: error:
unrecognized instruction mnemonic
                pmc_pmlc = mfpmr(PMR_PMLCa1);
                           ^
./machine/pmc_mdep.h:24:21: note: expanded from macro 'mfpmr'
          __asm __volatile("mfpmr %0,%1" : "=r"(val) : "K"(reg));       \
                           ^
<inline asm>:1:2: note: instantiated into assembly here
        mfpmr 10,145
        ^
/usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_e500.c:415:3: error:
unrecognized instruction mnemonic
                mtpmr(PMR_PMLCa1, pmc_pmlc);
                ^
./machine/pmc_mdep.h:21:19: note: expanded from macro 'mtpmr'
        __asm __volatile("mtpmr %0,%1" : : "K"(reg), "r"(val))
                         ^
<inline asm>:1:2: note: instantiated into assembly here
        mtpmr 145,10
        ^

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