The fetching instruction data are in refill_icache() instead of
fetch_slow_path(). This commit moves the mcontrol/mcontrol6 checking
from fetch_slow_path() to refill_icache() for the correct data value.

For example, consider an instruction 0xe9830313 (addi t1, t1, -360). The
previous implementation fires mcontrol data triggers with tdata2=0xe983
and tdata2=0x0313 but does not fire one with tdata2=0xe9830313, which is
incorrect. This commit fixes the issue.

The fetching PC is in refill_icache() instead of fetch_slow_path().
This commit moves the address mcontrol/mcontrol6 checking from
fetch_slow_path() to refill_icache() for the correct fetching PC.

For example, consider a 4-byte instruction at PC=0x4000. The Debug
specification recommends to compare PC={0x4000,0x4001,0x4002,0x4003};
otherwise, the Debug specification requires to compare PC=0x4000. The
previous implementation compares PC={0x4000,0x4002}, which is undesired.

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