[RISCV] Make Zcmt imply Zicsr. (llvm#75464)

This patch fixes build attributes w/r to Zcmt extension dependency on
Zicsr.

Author: yroux

llvm/lib/Support/RISCVISAInfo.cpp

@@ -1007,7 +1007,7 @@ static const char *ImpliedExtsZcd[] = {"d", "zca"};
 static const char *ImpliedExtsZce[] = {"zcb", "zcmp", "zcmt"};
 static const char *ImpliedExtsZcf[] = {"f", "zca"};
 static const char *ImpliedExtsZcmp[] = {"zca"};
-static const char *ImpliedExtsZcmt[] = {"zca"};
+static const char *ImpliedExtsZcmt[] = {"zca", "zicsr"};
 static const char *ImpliedExtsZdinx[] = {"zfinx"};
 static const char *ImpliedExtsZfa[] = {"f"};
 static const char *ImpliedExtsZfbfmin[] = {"f"};

llvm/test/MC/RISCV/attribute-arch.s

@@ -244,7 +244,7 @@
 # CHECK: attribute      5, "rv32i2p1_zca1p0_zcmp1p0"
 
 .attribute arch, "rv32izcmt1p0"
-# CHECK: attribute      5, "rv32i2p1_zca1p0_zcmt1p0"
+# CHECK: attribute      5, "rv32i2p1_zicsr2p0_zca1p0_zcmt1p0"
 
 .attribute arch, "rv64i_xsfvcp"
 # CHECK: attribute      5, "rv64i2p1_zicsr2p0_zve32x1p0_zvl32b1p0_xsfvcp1p0"

llvm/unittests/Support/RISCVISAInfoTest.cpp

@@ -519,8 +519,9 @@ TEST(ParseArchString, ZceImplication) {
   ASSERT_THAT_EXPECTED(MaybeRV32IZce, Succeeded());
   RISCVISAInfo::OrderedExtensionMap ExtsRV32IZce =
       (*MaybeRV32IZce)->getExtensions();
-  EXPECT_EQ(ExtsRV32IZce.size(), 6UL);
+  EXPECT_EQ(ExtsRV32IZce.size(), 7UL);
   EXPECT_EQ(ExtsRV32IZce.count("i"), 1U);
+  EXPECT_EQ(ExtsRV32IZce.count("zicsr"), 1U);
   EXPECT_EQ(ExtsRV32IZce.count("zca"), 1U);
   EXPECT_EQ(ExtsRV32IZce.count("zcb"), 1U);
   EXPECT_EQ(ExtsRV32IZce.count("zce"), 1U);
@@ -562,8 +563,9 @@ TEST(ParseArchString, ZceImplication) {
   ASSERT_THAT_EXPECTED(MaybeRV64IZce, Succeeded());
   RISCVISAInfo::OrderedExtensionMap ExtsRV64IZce =
       (*MaybeRV64IZce)->getExtensions();
-  EXPECT_EQ(ExtsRV64IZce.size(), 6UL);
+  EXPECT_EQ(ExtsRV64IZce.size(), 7UL);
   EXPECT_EQ(ExtsRV64IZce.count("i"), 1U);
+  EXPECT_EQ(ExtsRV64IZce.count("zicsr"), 1U);
   EXPECT_EQ(ExtsRV64IZce.count("zca"), 1U);
   EXPECT_EQ(ExtsRV64IZce.count("zcb"), 1U);
   EXPECT_EQ(ExtsRV64IZce.count("zce"), 1U);