Detect and report integer divide by zero on MT-Alpha and MT-SPARC.
Always print error-causing exception details, even when -q is specified.
Ensure 32 FP registers are allocated initially on MT-SPARC.
Extend the register info output with register aliases for better readability.
Fix handling of FP branches on MT-SPARC.
Also display the decimal value of registers in debug prints.
Do not offset the FP register window by 1 on MT-SPARC, since f0 is a regular register.