[clangd] Do not precent-encode numbers in URI.

clangd/URI.cpp

if (I->getName() != Scheme)
       continue;
     return I->instantiate();
   }
   return make_string_error("Can't find scheme: " + Scheme);
 }
 
 bool shouldEscape(unsigned char C) {
   // Unreserved characters.
-  if ((C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z'))
+  if ((C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') ||
+      (C >= '0' && C <= '9'))
     return false;
   switch (C) {
   case '-':
   case '_':
   case '.':
   case '~':
   case '/': // '/' is only reserved when parsing.
     return false;

unittests/clangd/URITests.cpp

URI parseOrDie(llvm::StringRef Uri) {
   if (!U)
     llvm_unreachable(llvm::toString(U.takeError()).c_str());
   return *U;
 }
 
 TEST(PercentEncodingTest, Encode) {
   EXPECT_EQ(URI("x", /*Authority=*/"", "a/b/c").toString(), "x:a/b/c");
   EXPECT_EQ(URI("x", /*Authority=*/"", "a!b;c~").toString(), "x:a%21b%3bc~");
+  EXPECT_EQ(URI("x", /*Authority=*/"", "a123b").toString(), "x:a123b");
 }
 
 TEST(PercentEncodingTest, Decode) {
   EXPECT_EQ(parseOrDie("x:a/b/c").body(), "a/b/c");
 
   EXPECT_EQ(parseOrDie("%3a://%3a/%3").scheme(), ":");
   EXPECT_EQ(parseOrDie("%3a://%3a/%3").authority(), ":");
   EXPECT_EQ(parseOrDie("%3a://%3a/%3").body(), "/%3");