Simplify usage of Compile::print_method() when debugging with gdb and enable its use with rr

When debugging with gdb, one can use

(gdb) call C->print_method(PHASE_FAILURE, 0, 0)

to print the current method. This, however, requires that all flags for enabling the Ideal Graph Visualizer to print methods in general are set. Moreover, if C is not defined one must either go up the stack or use:

(gdb) call Compile::current()->print_method(PHASE_FAILURE, 0, 0)

which is tedious. This could be simplified with a debug method such that we only need to call with an optional custom phase name:

(gdb) call print_method(phase_name)


The above gdb calls do not work when debugging with rr [1]. This RFE should also provide a possibility to print methods on the fly while stepping through the code with rr.

[1] https://rr-project.org/