Don't reset register file by default

hdl/hazard3_config.vh

@@ -207,7 +207,7 @@ parameter FAST_BRANCHCMP      = 1,
 // RESET_REGFILE: whether to support reset of the general purpose registers.
 // There are around 1k bits in the register file, so the reset can be
 // disabled e.g. to permit block-RAM inference on FPGA.
-parameter RESET_REGFILE       = 1,
+parameter RESET_REGFILE       = 0,
 
 // BRANCH_PREDICTOR: enable branch prediction. The branch predictor consists
 // of a single BTB entry which is allocated on a taken backward branch, and