Merge pull request #550 from antonio-nino-diaz-arm/an/dead_loops

bl2/aarch64/bl2_entrypoint.S

bl2u/aarch64/bl2u_entrypoint.S

bl31/aarch64/crash_reporting.S

bl32/tsp/aarch64/tsp_entrypoint.S

bl32/tsp/aarch64/tsp_exceptions.S

common/aarch64/debug.S

docs/porting-guide.md

include/common/el3_common_macros.S

include/plat/common/platform.h

plat/arm/board/fvp/aarch64/fvp_helpers.S

plat/arm/board/juno/aarch64/juno_helpers.S

plat/common/aarch64/platform_helpers.S