int getPcBias(boolean isThumb) {
		if (applyPcBiasToRelativeRelocations) {
			return isThumb ? 4 : 8;
		}
		return 0;
	}
Get the appropriate PC Bias value which should be applied to the computed relocation value.
This method and related option is intended as a work around for differences in how tool-chain
and associated loaders handle the PC Bias and if they factor it into the addend or not.
Within Ghidra, the default is to assume the PC Bias is not factored into the relocation addend
with the {@link ARM_ElfExtension#APPLY_PC_BIAS_TO_RELATIVE_RELOCATIONS_OPTION_NAME} option
being true.
<p>
Example as to how this PC Bias value factors into relocation value computation:
<pre>
   value = (symbolValue + addend) - (relocAddr + pcBias)
</pre>
Within the Sleigh language this bias may be reflected by:
<pre>
ARM:
   (inst_start + 8) or (inst_next + 4)
Thumb (either 16-bit or 32-bit forms): 
   (inst_start + 4)
</pre>
@param isThumb true if Thumb instruction, false if ARM
@return PC Bias value to be applied
Ghidra/Processors/ARM/src/main/java/ghidra/app/util/bin/format/elf/relocation/ARM_ElfRelocationContext.java