[PATCH v2 1/5] powerpc: ftrace: minor cleanup

Move the stack setup and teardown code to the ftrace_graph_caller(). This way, we don't incur the cost of setting it up unless function graph is enabled for this function. Also, remove the extraneous LR restore code after the function graph stub. LR has previously been restored and neither

[PATCH v2 1/5] powerpc: ftrace: minor cleanup

Move the stack setup and teardown code to the ftrace_graph_caller(). This way, we don't incur the cost of setting it up unless function graph is enabled for this function. Also, remove the extraneous LR restore code after the function graph stub. LR has previously been restored and neither