disallow some unaligned reads for ARMv7

armv7-align

diff --git a/build/probe.pm b/build/probe.pm
index ff5fcbe..835b9a6 100644
--- a/build/probe.pm
+++ b/build/probe.pm
@@ -234,11 +234,10 @@ sub unaligned_access {
         my $arch = `$command`;
         if (defined $arch) {
             chomp $arch;
-            if ($arch =~ /^(?:x86_64|amd64|i[0-9]86|armv7.*)$/) {
-                # ARMv7 not yet tested
+            if ($arch =~ /^(?:x86_64|amd64|i[0-9]86)$/) {
                 # Don't know alignment constraints for ARMv8
                 _gen_unaligned_access($config, 'all');
-            } elsif ($arch =~ /^armv6/) {
+            } elsif ($arch =~ /^armv(?:6|7)/) {
                 _gen_unaligned_access($config, 'int32');
             } else {
                 # ARMv5 and earlier do "interesting" things on unaligned 32 bit

gistfile1.txt

clang 3.4 on ARMv7 is crashy when it does unaligned reads:

    Starting program: /var/tmp/moar-clang/bin/moar --libpath=src/vm/moar/stage0 src/vm/moar/stage0/nqp.moarvm --bootstrap --setting=NULL --no-regex-lib --target=mbc --output=gen/moar/stage1/nqpmo.moarvm gen/moar/stage1/nqpmo.nqp
    [Thread debugging using libthread_db enabled]
    Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".

    Program received signal SIGBUS, Bus error.
    0xb6d7186c in MVM_BC_get_N64 (cur_op=0x4a4340 "\b", offset=2) at src/core/interp.h:103
    103         return *(MVMnum64 *)where;

The attached patch aligns those reads for ARMv7.

It's worth noting that gcc 4.8.2 built moar on ARMv7 wasn't crashy, this patch probably penalizes gcc.