[AMDGPU] Include missing FeatureMADIntraFwdBug in gfx11-generic (#89936)

It seems like this happened because #79460 moved this from
`FeatureISAVersion11_Common` to `FeatureISAVersion11_0_Common` while
#76955 was being reviewed.

Author: epilk

llvm/lib/Target/AMDGPU/AMDGPU.td

@@ -1493,6 +1493,7 @@ def FeatureISAVersion11_Generic: FeatureSet<
     [FeatureMSAALoadDstSelBug,
      FeatureVALUTransUseHazard,
      FeatureUserSGPRInit16Bug,
+     FeatureMADIntraFwdBug,
      FeaturePrivEnabledTrap2NopBug,
      FeatureRequiresCOV6])>;
 

llvm/test/CodeGen/AMDGPU/mad_64_32.ll

@@ -5,6 +5,7 @@
 ; RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -verify-machineinstrs < %s | FileCheck -check-prefixes=GFX11,GFX1100 %s
 ; RUN: llc -mtriple=amdgcn -mcpu=gfx1150 -verify-machineinstrs < %s | FileCheck -check-prefixes=GFX11,GFX1150 %s
 ; RUN: llc -mtriple=amdgcn -mcpu=gfx1200 -verify-machineinstrs < %s | FileCheck -check-prefixes=GFX12 %s
+; RUN: llc -mtriple=amdgcn -mcpu=gfx11-generic --amdhsa-code-object-version=6 -verify-machineinstrs < %s | FileCheck -check-prefixes=GFX11,GFX1100 %s
 
 ; On GFX11, ensure vdst and src2 do not partially overlap. Full overlap is ok.