[gn] port 12a8bc0 more

The test reaches into internal headers. Make sure generated files
are ready for that.

(This is the only place. If there were more, we should use public_deps
instead.)

Author: nico

llvm/utils/gn/secondary/llvm/lib/Target/RISCV/BUILD.gn

@@ -15,7 +15,10 @@ tablegen("RISCVGenCompressInstEmitter") {
 }
 
 tablegen("RISCVGenMacroFusion") {
-  visibility = [ ":LLVMRISCVCodeGen" ]
+  visibility = [
+    ":LLVMRISCVCodeGen",
+    "//llvm/unittests/Target/RISCV:RISCVTests",
+  ]
   args = [ "-gen-macro-fusion-pred" ]
   td_file = "RISCV.td"
 }

llvm/utils/gn/secondary/llvm/unittests/Target/RISCV/BUILD.gn

@@ -4,6 +4,10 @@ unittest("RISCVTests") {
   deps = [
     "//llvm/lib/MC",
     "//llvm/lib/Target/RISCV:LLVMRISCVCodeGen",
+
+    # RISCVInstrInfoTest.cpp includes the internal header RISCVSubtarget.h,
+    # which includes the generated file RISCVGenMacroFusion.inc.
+    "//llvm/lib/Target/RISCV:RISCVGenMacroFusion",
     "//llvm/lib/Target/RISCV/MCTargetDesc",
     "//llvm/lib/Target/RISCV/TargetInfo",
     "//llvm/lib/TargetParser",