[UM-61 TCG Maint]

3 different attempts at fixing the out-of-temps failure produced by the tcg-constant patch set. The last, longjmp to restart w/ a smaller tb, seems unlikely to have unanticipated side effects.

[UM-2 QEMU Maint]

Refresh two patches toward cortex-a76. Misc patch review. Partial fix for target/ppc mis-use of tb->flags.

r~