[Bug go/64999] s390x libgo test failure in TestMemoryProfiler

[vogt at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64999

--- Comment #20 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
runtime_MProf_Malloc() calls runtime_callers() without going through
runtime.Callers():

#0  runtime_callers (skip=skip@entry=1, locbuf=locbuf@entry=0xc2094734b8, 
    m=m@entry=32, keep_thunks=keep_thunks@entry=0 '\000')
    at ../../../libgo/runtime/go-callers.c:186
#1  0x0000000080023150 in runtime_MProf_Malloc (p=p@entry=0xc20957ac00, 
    size=size@entry=1024) at ../../../libgo/runtime/mprof.goc:189
#2  0x0000000080021722 in profilealloc (size=1024, v=0xc20957ac00)
    at ../../../libgo/runtime/malloc.goc:315
#3  runtime_mallocgc (size=size@entry=1024, typ=typ@entry=2148440120, 
    flag=flag@entry=0) at ../../../libgo/runtime/malloc.goc:253
#4  0x000000008000e30e in __go_new (
    td=td@entry=0x800e9838 <__go_td_S1_xAN5_uint81024ee>, size=size@entry=1024)
    at ../../../libgo/runtime/go-new.c:15
#5  0x000000008000c174 in pprof_test.allocateTransient1M () at mprof_test.go:21
#6  0x000000008000c3d2 in runtime_pprof_test.TestMemoryProfiler (
    t=0xc2088502d0) at mprof_test.go:64