Missing pseudo instructions for l{b,h,d}

[drepekh]

Seeing that there exists lw t1, %lo(label)(t2) it would make sense to add similar form for instructions l{b,h,d}. Additionally, ld is only available in the form of ld t1, -100(t2), so it would probably make sense to extend it to be consistent with other load instructions.

[TheThirdOne]

The current instructions were added because they are very common in GCC-generated assembly.

The relevant code is:

rars/src/PseudoOps.txt

Lines 257 to 262 in 46ab74d

	### GCC compatability
	lui t1,%hi(label) ;lui RG1,LH4 ;#Load Upper Address : Set t1 to upper 20-bit label's address
	addi t1,t2,%lo(label) ;addi RG1,RG2,LL5 ;#Load Lower Address : Set t1 to t2 + lower 12-bit label's address
	lw t1,%lo(label)(t2) ;lw RG1,LL4(RG7) ;#Load from Address
	flw f1,%lo(label)(t2) ;flw RG1,LL4(RG7) ;#Load from Address
	flwd f1,%lo(label)(t2) ;fld RG1,LL4(RG7) ;#Load from Address