Quiet Coverity

[jhibbits]

Summary

Coverity warns that unsigned >= 0 is always true, and k_first_gpr_powerpc happens to be 0. Quiet Coverity by changing that comparison instead to a static_assert(), in case things change in the future.

lldb/trunk/source/Plugins/Process/Utility/RegisterContextPOSIX_powerpc.cpp

 static const RegisterSet
 g_reg_sets_powerpc[k_num_register_sets] =
 {
     { "General Purpose Registers",  "gpr", k_num_gpr_registers_powerpc, g_gpr_regnums },
     { "Floating Point Registers",  "fpr", k_num_fpr_registers_powerpc, g_fpr_regnums },
     { "Altivec/VMX Registers",  "vmx", k_num_vmx_registers_powerpc, g_vmx_regnums },
 };
 
+static_assert(k_first_gpr_powerpc == 0, "GPRs must index starting at 0, or fix IsGPR()");
 bool RegisterContextPOSIX_powerpc::IsGPR(unsigned reg)
 {
-    return (reg >= k_first_gpr_powerpc) && (reg <= k_last_gpr_powerpc);   // GPR's come first.
+    return (reg <= k_last_gpr_powerpc);   // GPR's come first.
 }
 
 bool
 RegisterContextPOSIX_powerpc::IsFPR(unsigned reg)
 {
     return (reg >= k_first_fpr) && (reg <= k_last_fpr);
 }